In material of arbitration the referees are free of regular the articulation of the procedure in the way that they consider more appropriate, even devouting from the prescribed mi dictates from the code of rite, with the only limit of the compliance of the Dervable principle of the contradictory, place by art. 101 cod. proc. civ. (in the species, it is it was excluded the violation of the principle of the contradictory for having the technical consultant nominated from tri Bunale arbitral requested documents accounting not products interloquand with i i consultants of part that nothing have deduced e the recurrent had complained the lesion of the contradictory recalling previous on nature, powers of investigation e preclusioni che encounters the consultant technician office in the ordinary judgments of cognition, without put them however in ratio with the different judgment arbitral and with the rules own the latter).